A hydraulic cylinder control system

Abstract

The application provides a hydraulic cylinder control system and relates to the technical field of excavator external accessories, and the system comprises a hydraulic cylinder, a first oil path, a second oil path, a first one-way throttle valve and a second one-way throttle valve; one end of the first oil path is communicated with a rod cavity and is used for supplying oil into the rod cavity or discharging hydraulic oil in the rod cavity; one end of the second oil path is communicated with a rodless cavity and is used for discharging hydraulic oil in the rodless cavity or supplying oil into the rodless cavity; the first one-way throttle valve and the second one-way throttle valve are arranged in series on the first oil path and are arranged in opposite directions; the first one-way throttle valve is used for controlling the flow of the first oil path when the hydraulic oil flows in the first oil path in a forward direction; and the second one-way throttle valve is used for controlling the flow of the first oil path when the hydraulic oil flows in the first oil path in a reverse direction. The hydraulic pipeline and the hydraulic element are simplified, and the linkage control of the hydraulic cylinder and the hydraulic motor can be realized without increasing the hydraulic circuit.

Description

Technical Field

[0001] This invention relates to the field of excavator external attachment technology, and in particular to a hydraulic cylinder control system. Background Technology

[0002] Currently, controlling the lubrication function of the hydraulic cylinder motor chain on excavator attachments requires a separate hydraulic circuit. Each circuit is controlled by a separate hydraulic circuit, resulting in a complex and cumbersome system. The limited internal space of the excavator attachment itself leads to a high failure rate, difficult maintenance, and high costs when multiple hydraulic circuits are installed. This invention aims to achieve the desired function by controlling the lubrication function of the hydraulic cylinder motor chain with a single hydraulic circuit without adding additional circuits. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic cylinder control system to solve at least one of the aforementioned technical problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides a hydraulic cylinder control system, comprising: a hydraulic cylinder, a first oil circuit, a second oil circuit, a first one-way throttle valve, and a second one-way throttle valve;

[0005] One end of the first oil circuit is connected to the rod chamber of the hydraulic cylinder, and is used to supply oil to the rod chamber of the hydraulic cylinder or to discharge hydraulic oil from the rod chamber of the hydraulic cylinder;

[0006] One end of the second oil circuit is connected to the rodless chamber of the hydraulic cylinder, and is used for discharging hydraulic oil from the rodless chamber of the hydraulic cylinder or supplying oil to the rodless chamber of the hydraulic cylinder;

[0007] The first one-way throttle valve and the second one-way throttle valve are connected in series in the first oil circuit and are arranged in opposite directions;

[0008] The first one-way throttle valve is used to control the flow rate of the first oil circuit when the hydraulic oil flows in the forward direction in the first oil circuit, while the first one-way throttle valve does not have a throttling effect when the hydraulic oil flows in the reverse direction in the first oil circuit.

[0009] The first one-way throttle valve is composed of a first one-way valve and a first throttle valve connected in parallel;

[0010] The first check valve is used to prevent hydraulic oil from flowing through when hydraulic oil is flowing forward in the first oil circuit;

[0011] The first throttle valve is connected in parallel across the first check valve and is used to control the flow rate of the first oil circuit when hydraulic oil cannot flow through the first check valve.

[0012] When the hydraulic oil flows forward in the first oil circuit, it presses the valve core of the first check valve tightly against the valve seat, preventing the hydraulic oil from flowing through the first check valve. This allows the hydraulic oil to flow forward through the first throttle valve in the first oil circuit, thus adjusting the first throttle valve controls the flow rate of the first oil circuit. When the hydraulic oil flows backward in the first oil circuit, it pushes the valve core of the first check valve open from the valve seat, allowing the hydraulic oil to flow backward through the first check valve in the first oil circuit. Therefore, the first throttle valve does not have a throttling effect.

[0013] The second one-way throttle valve is used to control the flow rate of the first oil circuit when the hydraulic oil flows in reverse in the first oil circuit, while the second one-way throttle valve does not have a throttling effect when the hydraulic oil flows in the first oil circuit in the forward direction.

[0014] The second one-way throttle valve is composed of a second one-way valve and a second throttle valve connected in parallel;

[0015] The second check valve is used to prevent hydraulic oil from flowing through when the hydraulic oil flows in the reverse direction in the first oil circuit;

[0016] The second throttle valve is connected in parallel across the two ends of the second check valve and is used to control the flow rate of the first oil circuit when hydraulic oil cannot flow through the second check valve.

[0017] When the hydraulic oil flows in reverse within the first oil circuit, it presses the valve core of the second check valve tightly against the valve seat, preventing the hydraulic oil from flowing through the second check valve. This forces the hydraulic oil to flow in reverse within the first oil circuit only through the second throttle valve, thus allowing the flow rate of the first oil circuit to be controlled by adjusting the second throttle valve. When the hydraulic oil flows in forward within the first oil circuit, it pushes the valve core of the second check valve open from the valve seat, allowing the hydraulic oil to flow in forward within the first oil circuit through the second check valve. Therefore, the first throttle valve does not have a throttling effect.

[0018] Furthermore, the hydraulic cylinder control system also includes: a return oil tank T, an overflow oil circuit, and a two-way overflow valve;

[0019] The other end of the first oil circuit is port A;

[0020] The other end of the second oil circuit is port B;

[0021] Port A and Port B can be selectively connected to the hydraulic oil source and the return oil tank T, respectively.

[0022] Furthermore, the hydraulic cylinder control system also includes: an overflow oil circuit and a two-way overflow valve;

[0023] One end of the overflow oil circuit is connected to port A, and the other end is connected to port B, for the overflow of hydraulic oil;

[0024] The bidirectional overflow valve is installed on the overflow oil line and is used to cause hydraulic oil in the first oil line to overflow into the overflow oil line and flow back to the return oil tank T through the B port when the oil supply pressure at port A is too high; or, when the oil supply pressure at port B is too high, cause hydraulic oil in the second oil line to overflow into the overflow oil line and flow back to the return oil tank T through port A.

[0025] The bidirectional overflow valve is composed of a first overflow valve and a second overflow valve connected in parallel.

[0026] Furthermore, the oil inlet of the first overflow valve is connected to port A, and the oil outlet of the first overflow valve is connected to port B, which is used to cause the hydraulic oil in the first oil circuit to overflow into the overflow oil circuit and flow back to the return oil tank T through port B when the oil supply pressure at port A is too high.

[0027] When the oil supply pressure at port A is too high, the hydraulic oil pushes the valve core of the first relief valve to overcome the spring force, and the valve port opens. The hydraulic oil can flow from the oil inlet of the first relief valve to the oil drain port, so that the excess hydraulic oil flows back to the oil tank T through the relief oil circuit from port B, which plays an overload protection role.

[0028] Furthermore, the oil inlet of the second overflow valve is connected to the B port, and the oil outlet of the second overflow valve is connected to the A port, which is used to cause the hydraulic oil in the second oil circuit to overflow into the overflow oil circuit and flow back to the return oil tank T through the A port when the oil supply pressure at the B port is too high.

[0029] When the oil supply pressure at port B is too high, the valve core of the second relief valve connects the oil inlet and the oil outlet of the second relief valve. The hydraulic oil pushes the valve core of the second relief valve to overcome the spring force, and the valve opens. The hydraulic oil can flow from the oil inlet of the second relief valve to the oil outlet, so that the excess hydraulic oil flows back to the oil tank T from port A through the relief oil circuit, which plays an overload protection role.

[0030] Furthermore, the hydraulic cylinder control system also includes: a third oil circuit, a hydraulic motor, and a back pressure check valve;

[0031] One end of the third oil circuit is connected to port A, and the other end is connected to the return oil tank T. It is used to supply oil to the hydraulic motor and to discharge the hydraulic oil in the hydraulic motor 5 back to the return oil tank T.

[0032] The hydraulic motor and the back pressure check valve are connected in series in the third oil circuit;

[0033] The oil inlet of the hydraulic motor is connected to port A, and the oil return port of the hydraulic motor is connected to the oil inlet of the back pressure check valve, for driving the attachment chain.

[0034] The inlet of the back pressure check valve is connected to the return port of the hydraulic motor, and the outlet of the back pressure check valve is connected to the return tank T, which is used to prevent hydraulic oil from flowing back into the hydraulic motor through the third oil circuit.

[0035] The back pressure of the back pressure check valve is greater than the pressure of the hydraulic oil returning from the rod chamber of the hydraulic cylinder.

[0036] When hydraulic oil flows from the hydraulic motor to the return oil tank T, the hydraulic oil pushes the valve core of the back pressure check valve open from the valve seat, compressing the spring of the back pressure check valve, and the hydraulic oil flows through the back pressure check valve to the return oil tank T; when hydraulic oil flows from the return oil tank T to the hydraulic motor, the hydraulic oil presses the valve core of the back pressure check valve tightly against the valve seat, and the hydraulic oil cannot flow through the back pressure check valve to the hydraulic motor.

[0037] Furthermore, the hydraulic cylinder control system also includes: a first drain oil circuit and a third check valve;

[0038] One end of the first drain oil passage is connected to the drain port of the hydraulic motor, and the other end is connected to port B, which is used to discharge the hydraulic oil leaked from the high-pressure chamber of the hydraulic motor into the housing through port B.

[0039] The third check valve is installed in the first drain oil line. The inlet of the third check valve is connected to the drain port of the hydraulic motor, and the outlet of the third check valve is connected to port B. This is used to prevent the hydraulic oil in the overflow oil line from flowing back into the hydraulic motor through the first drain oil line.

[0040] When hydraulic oil flows from the drain port of the hydraulic motor to port B, the hydraulic oil pushes the valve core of the third check valve open from the valve seat, and the hydraulic oil flows from the first drain oil passage to port B through the third check valve. When hydraulic oil flows from the overflow oil passage to the hydraulic motor, the hydraulic oil presses the valve core of the third check valve tightly against the valve seat, and the hydraulic oil cannot flow through the third check valve. Therefore, the hydraulic oil in the overflow oil passage cannot flow back into the hydraulic motor through the first drain oil passage.

[0041] Furthermore, the hydraulic cylinder control system also includes: a chain lubrication oil circuit, a hydraulic check valve, a third throttle valve, and a chain lubrication oil port;

[0042] One end of the chain lubrication oil circuit is connected to the drain port of the hydraulic motor, and the other end is connected to the chain lubrication oil port, which is used to discharge the hydraulic oil in the hydraulic motor housing through the chain lubrication oil port;

[0043] The hydraulic control check valve is installed on the chain lubrication oil circuit. The oil outlet of the hydraulic control check valve is connected to the oil drain port of the hydraulic motor, and the oil inlet of the hydraulic control check valve is connected to the chain lubrication oil port. It is used to discharge the hydraulic oil in the hydraulic motor housing through the chain lubrication oil port when the control port of the hydraulic control check valve receives a pressure signal.

[0044] The third throttle valve is installed on the chain lubrication oil circuit. The third throttle valve is located between the oil inlet of the hydraulic check valve and the chain lubrication oil inlet, and is used to control the flow rate of the chain lubrication oil circuit.

[0045] Furthermore, the hydraulic cylinder control system also includes: a control oil circuit, a second drain oil circuit, and a fourth check valve;

[0046] One end of the control oil circuit is connected to the third oil circuit, and the other end is connected to the control oil port of the hydraulic check valve, for supplying control oil to the control oil port of the hydraulic check valve.

[0047] One end of the control oil circuit that connects to the third oil circuit is located between the return port of the hydraulic motor and the inlet port of the back pressure check valve.

[0048] When hydraulic oil flows from the return port of the hydraulic motor to the back pressure check valve, the spring of the back pressure check valve is compressed, thereby introducing control oil into the control port of the hydraulic check valve. The control oil acts on the control piston of the hydraulic check valve, giving a pressure signal to the control port of the hydraulic check valve, pushing the valve core of the hydraulic check valve to overcome the spring force, and the valve port opens. Hydraulic oil can flow from the outlet port to the inlet port of the hydraulic check valve, thereby discharging the hydraulic oil leaked from the high pressure chamber of the hydraulic motor into the housing through the chain lubrication port for chain lubrication.

[0049] One end of the second drain oil circuit is connected to the drain port of the hydraulic motor, and the other end is connected to the control oil circuit. It is used to allow the hydraulic oil leaked from the high-pressure chamber of the hydraulic motor into the housing to flow into the third oil circuit through the control oil circuit at the moment when the B port switches from being connected to the return oil tank T to being connected to the hydraulic oil source, and then flow back to the return oil tank T through the back pressure check valve.

[0050] The inlet of the fourth check valve is connected to the drain port of the hydraulic motor, and the outlet of the fourth check valve is connected to the control oil circuit, which is used to prevent the hydraulic oil in the control oil circuit from flowing back into the hydraulic motor.

[0051] At the instant when port B switches from being connected to the return oil tank T to being connected to the hydraulic oil source, the pressure at port B increases, the third check valve closes, and the hydraulic oil in the hydraulic motor housing cannot be discharged from port B through the first drain oil circuit. The hydraulic oil in the hydraulic motor housing flows into the second drain oil circuit, and the hydraulic oil pushes the valve core of the fourth check valve open from the valve seat. The hydraulic oil flows from the fourth check valve into the control oil circuit, through the control oil circuit into the third oil circuit, and then back to the return oil tank T through the back pressure check valve.

[0052] By adopting the above technical solution, the present invention has the following beneficial effects:

[0053] The hydraulic cylinder control system provided by this invention simplifies the hydraulic pipelines and hydraulic components, and can realize the linkage control of the hydraulic cylinder and hydraulic motor without adding a hydraulic circuit; the oil is supplied to the chain lubrication port by draining oil from the hydraulic motor drain port, eliminating the need to set up a separate chain lubrication oil circuit, further simplifying the hydraulic circuit. Attached Figure Description

[0054] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1 This is a schematic diagram of a hydraulic cylinder control system provided in an embodiment of the present invention; reference numerals:

[0056] 1-First one-way throttle valve; 2-Second one-way throttle valve; 3-Two-way relief valve; 31-First relief valve; 32-Second relief valve; 4-Hydraulic cylinder; 5-Hydraulic motor; 6-Back pressure check valve; 7-Third check valve; 8-Fourth check valve; 9-Hydraulic control check valve; 10-Third throttle valve; 11-Chain lubrication port. Detailed Implementation

[0057] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] The present invention will be further explained below with reference to specific embodiments.

[0061] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed by the present invention to further explain the specific content of the invention, and these settings can be combined or used in conjunction with each other.

[0062] like Figure 1 As shown, this embodiment provides a hydraulic cylinder control system, including: a hydraulic cylinder 4, a first oil circuit, a second oil circuit, a first one-way throttle valve 1, and a second one-way throttle valve 2; one end of the first oil circuit is connected to the rod chamber of the hydraulic cylinder 4, and is used to supply oil to the rod chamber of the hydraulic cylinder 4 or to discharge hydraulic oil from the rod chamber of the hydraulic cylinder 4; one end of the second oil circuit is connected to the rodless chamber of the hydraulic cylinder 4, and is used to discharge hydraulic oil from the rodless chamber of the hydraulic cylinder 4 or to supply oil to the rodless chamber of the hydraulic cylinder 4; the first one-way throttle valve 1 and the second one-way throttle valve 2 are connected in series in the first oil circuit and are arranged in opposite directions; the first one-way throttle valve 1 is used to control the flow rate of the first oil circuit when the hydraulic oil flows in the forward direction in the first oil circuit, while the first one-way throttle valve 1 does not have a throttling effect when the hydraulic oil flows in the reverse direction in the first oil circuit;

[0063] In this embodiment, the first one-way throttle valve 1 is composed of a first one-way valve and a first throttle valve connected in parallel; the first one-way valve is used to prevent hydraulic oil from flowing through when hydraulic oil is flowing in the first oil circuit in the forward direction; the first throttle valve is connected in parallel at both ends of the first one-way valve and is used to control the flow rate of the first oil circuit when hydraulic oil cannot flow through the first one-way valve.

[0064] When the hydraulic oil flows forward in the first oil circuit, it presses the valve core of the first check valve tightly against the valve seat, preventing the hydraulic oil from flowing through the first check valve. This allows the hydraulic oil to flow forward through the first throttle valve in the first oil circuit, thus adjusting the first throttle valve controls the flow rate of the first oil circuit. When the hydraulic oil flows backward in the first oil circuit, it pushes the valve core of the first check valve open from the valve seat, allowing the hydraulic oil to flow backward through the first check valve in the first oil circuit. Therefore, the first throttle valve does not have a throttling effect.

[0065] The second one-way throttle valve 2 is used to control the flow rate of the first oil circuit when the hydraulic oil flows in reverse in the first oil circuit, while the second one-way throttle valve 2 does not have a throttling effect when the hydraulic oil flows in the first oil circuit.

[0066] In this embodiment, the second one-way throttle valve 2 is composed of a second one-way valve and a second throttle valve connected in parallel; the second one-way valve is used to prevent hydraulic oil from flowing through when the hydraulic oil flows in reverse in the first oil circuit; the second throttle valve is connected in parallel at both ends of the second one-way valve and is used to control the flow rate of the first oil circuit when the hydraulic oil cannot flow through the second one-way valve.

[0067] When the hydraulic oil flows in reverse within the first oil circuit, it presses the valve core of the second check valve tightly against the valve seat, preventing the hydraulic oil from flowing through the second check valve. This forces the hydraulic oil to flow in reverse within the first oil circuit only through the second throttle valve, thus allowing the flow rate of the first oil circuit to be controlled by adjusting the second throttle valve. When the hydraulic oil flows in forward within the first oil circuit, it pushes the valve core of the second check valve open from the valve seat, allowing the hydraulic oil to flow in forward within the first oil circuit through the second check valve. Therefore, the first throttle valve does not have a throttling effect.

[0068] Furthermore, the hydraulic cylinder control system also includes a return oil tank T; the other end of the first oil circuit is port A, and the other end of the second oil circuit is port B. Port A and port B can be selectively connected to the hydraulic oil source and the return oil tank T, respectively, through a two-position four-way control valve.

[0069] Hydraulic oil flows from the hydraulic oil source through port A to the rod chamber of the hydraulic cylinder 4, which is the forward flow of hydraulic oil in the first oil circuit; while hydraulic oil flows from the rod chamber of the hydraulic cylinder 4 back to the oil tank T through port A, which is the reverse flow.

[0070] More preferably, the hydraulic cylinder control system further includes: an overflow oil circuit and a two-way overflow valve 3; one end of the overflow oil circuit is connected to port A, and the other end is connected to port B, for the overflow of hydraulic oil; the two-way overflow valve 3 is disposed on the overflow oil circuit, for the hydraulic oil in the first oil circuit to overflow and flow back to the oil tank T through port B when the oil supply pressure at port A is too high; or, for the hydraulic oil in the second oil circuit to overflow and flow back to the oil tank T through port A when the oil supply pressure at port B is too high. In this embodiment, the two-way overflow valve 3 is composed of a first overflow valve 31 and a second overflow valve 32 connected in parallel;

[0071] Wherein, the oil inlet of the first overflow valve 31 is connected to the A port, and the oil outlet of the first overflow valve 31 is connected to the B port, which is used to overflow the hydraulic oil in the first oil circuit and flow back to the oil tank T through the B port when the oil supply pressure at the A port is too high.

[0072] When the oil supply pressure at port A is too high, the hydraulic oil pushes the valve core of the first relief valve 31 to overcome the spring force, and the valve port opens. The hydraulic oil can flow from the oil inlet of the first relief valve 31 to the oil outlet, so that the excess hydraulic oil flows back to the oil tank T from port B through the relief oil circuit, which plays an overload protection role.

[0073] Wherein, the oil inlet of the second overflow valve 32 is connected to the B port, and the oil outlet of the second overflow valve 32 is connected to the A port, which is used to allow hydraulic oil in the second oil circuit to overflow and flow back to the oil tank T through the A port when the oil supply pressure at the B port is too high.

[0074] When the oil supply pressure at port B is too high, the valve core of the second relief valve 32 connects the oil inlet and the oil outlet of the second relief valve 32. The hydraulic oil pushes the valve core of the second relief valve 32 to overcome the spring force, and the valve opens. The hydraulic oil can flow from the oil inlet of the second relief valve 32 to the oil outlet, so that the excess hydraulic oil flows back to the oil tank T from port A through the relief oil circuit, which plays an overload protection role.

[0075] More preferably, the hydraulic cylinder control system further includes: a third oil circuit, a hydraulic motor 5, and a back pressure check valve 6; one end of the third oil circuit is connected to port A, and the other end is connected to the return oil tank T, for supplying oil to the hydraulic motor 5; the hydraulic motor 5 and the back pressure check valve 6 are connected in series in the third oil circuit; the oil inlet of the hydraulic motor 5 is connected to port A, and the oil return port of the hydraulic motor 5 is connected to the oil inlet of the back pressure check valve 6, for driving the attachment chain; the oil inlet of the back pressure check valve 6 is connected to the oil return port of the hydraulic motor 5, and the oil outlet of the back pressure check valve 6 is connected to the return oil tank T, for preventing hydraulic oil from flowing back into the hydraulic motor 5; the back pressure of the back pressure check valve 6 is greater than the pressure of the hydraulic oil returning from the rod chamber of the hydraulic cylinder 4.

[0076] When hydraulic oil flows from the hydraulic motor 5 to the return oil tank T, the hydraulic oil pushes the valve core of the back pressure check valve 6 off the valve seat, compressing the spring of the back pressure check valve 6, and the hydraulic oil flows through the back pressure check valve 6 to the return oil tank T; when hydraulic oil flows from the return oil tank T to the hydraulic motor 5, the hydraulic oil presses the valve core of the back pressure check valve 6 tightly against the valve seat, and the hydraulic oil cannot flow through the back pressure check valve 6 to the hydraulic motor 5.

[0077] More preferably, the hydraulic cylinder control system further includes: a first drain oil circuit and a third check valve 7; one end of the first drain oil circuit is connected to the drain port of the hydraulic motor 5, and the other end is connected to port B, for discharging the hydraulic oil leaking from the high-pressure chamber of the hydraulic motor 5 into the housing through port B; the third check valve 7 is disposed on the first drain oil circuit; the inlet of the third check valve 7 is connected to the drain port of the hydraulic motor 5, and the outlet of the third check valve 7 is connected to port B, for preventing the hydraulic oil in the overflow circuit from flowing back into the hydraulic motor 5 through the first drain oil circuit.

[0078] When hydraulic oil flows from the drain port of the hydraulic motor 5 to port B, the hydraulic oil pushes the valve core of the third check valve 7 open from the valve seat, and the hydraulic oil flows from the first drain oil passage to port B through the third check valve 7. When hydraulic oil flows from the overflow oil passage to the hydraulic motor 5, the hydraulic oil presses the valve core of the third check valve 7 tightly against the valve seat, and the hydraulic oil cannot flow through the third check valve 7. Therefore, the hydraulic oil in the overflow oil passage cannot flow back into the hydraulic motor 5 through the first drain oil passage.

[0079] More preferably, the hydraulic cylinder control system further includes: a chain lubrication oil circuit, a hydraulic control check valve 9, a third throttle valve 10, and a chain lubrication oil port 11; one end of the chain lubrication oil circuit is connected to the drain port of the hydraulic motor 5, and the other end is connected to the chain lubrication oil port 11, for discharging the hydraulic oil in the housing of the hydraulic motor 5 through the chain lubrication oil port 11;

[0080] The hydraulic control check valve 9 is installed on the chain lubrication oil circuit. The oil outlet of the hydraulic control check valve 9 is connected to the oil drain port of the hydraulic motor 5, and the oil inlet of the hydraulic control check valve 9 is connected to the chain lubrication oil port 11. It is used to discharge the hydraulic oil in the housing of the hydraulic motor 5 through the chain lubrication oil port 11 when the control port of the hydraulic control check valve 9 receives a pressure signal.

[0081] The third throttle valve 10 is disposed on the chain lubrication oil circuit. The third throttle valve 10 is disposed between the oil inlet of the hydraulic check valve 9 and the chain lubrication oil inlet 11, and is used to control the flow rate of the chain lubrication oil circuit.

[0082] Furthermore, the hydraulic cylinder control system further includes: a control oil circuit, a second drain oil circuit, and a fourth check valve 8;

[0083] One end of the control oil circuit is connected to the third oil circuit, and the other end is connected to the control oil port of the hydraulic check valve 9, for supplying control oil to the control oil port of the hydraulic check valve 9.

[0084] One end of the control oil circuit that connects to the third oil circuit is located between the return port of the hydraulic motor 5 and the inlet port of the back pressure check valve 6.

[0085] When hydraulic oil flows from the return port of the hydraulic motor 5 to the back pressure check valve 6, the spring of the back pressure check valve 6 is compressed, thereby introducing control oil into the control port of the hydraulic check valve. The control oil acts on the control piston of the hydraulic check valve, giving a pressure signal to the control port of the hydraulic control check valve 9, pushing the valve core of the hydraulic check valve to overcome the spring force, and the valve port opens. Hydraulic oil can flow from the outlet port to the inlet port of the hydraulic check valve, thereby discharging the hydraulic oil leaked from the high pressure chamber of the hydraulic motor 5 into the housing through the chain lubrication port 11 for chain lubrication.

[0086] One end of the second drain oil circuit is connected to the drain port of the hydraulic motor 5, and the other end is connected to the control oil circuit. It is used to allow the hydraulic oil leaking from the high-pressure chamber of the hydraulic motor 5 into the housing to flow into the third oil circuit through the control oil circuit at the moment when the B port switches from being connected to the return oil tank T to being connected to the hydraulic oil source, and then flow back to the return oil tank T through the back pressure check valve 6. The inlet of the fourth check valve 8 is connected to the drain port of the hydraulic motor 5, and the outlet of the fourth check valve 8 is connected to the control oil circuit, which is used to prevent the hydraulic oil in the control oil circuit from flowing back into the hydraulic motor 5.

[0087] At the instant that port B switches from being connected to the return oil tank T to being connected to the hydraulic oil source, the pressure at port B increases, the third check valve 7 closes, and the hydraulic oil in the housing of the hydraulic motor 5 cannot be discharged from port B through the first drain oil circuit. Instead, the hydraulic oil in the housing of the hydraulic motor 5 flows into the second drain oil circuit. The hydraulic oil pushes the valve core of the fourth check valve 8 open from the valve seat, and the hydraulic oil flows from the fourth check valve 8 into the control oil circuit, then into the third oil circuit, and finally back to the return oil tank T via the back pressure check valve 6. The back pressure of the back pressure check valve 6 is less than the pressure when the second drain oil circuit is draining.

[0088] This embodiment provides a hydraulic cylinder control system. When the hydraulic oil source is connected to port A and the return oil tank T is connected to port B, the hydraulic oil flows from port A into the first oil circuit, passes through the first one-way throttle valve 1 and the second one-way throttle valve 2 and flows into the rod chamber of the hydraulic cylinder 4. The hydraulic cylinder rod retracts, and the hydraulic oil in the rodless chamber of the hydraulic cylinder 4 flows into the second oil circuit and flows back to the return oil tank T from port B.

[0089] When hydraulic oil flows forward from port A of the first oil circuit to the rod chamber of the hydraulic cylinder 4, the first one-way throttle valve 1 is adjusted to control the flow rate of the first oil circuit, thereby controlling the speed of hydraulic cylinder rod retraction.

[0090] When the oil supply pressure at port A is too high, the first relief valve 31 opens, and the hydraulic oil can flow from the oil inlet of the first relief valve 31 to the oil drain port, so that the excess hydraulic oil flows back to the oil tank T from port B through the relief oil circuit, which plays an overload protection role.

[0091] When the hydraulic oil source is connected to port A and the return oil tank T is connected to port B, the hydraulic oil flows from port A into the third oil circuit, passes through the hydraulic motor 5 and the back pressure check valve 6, and flows into the return oil tank T.

[0092] Hydraulic oil flows in from the inlet of the hydraulic motor 5 and flows out from the return port, driving the hydraulic motor 5 to rotate, thereby driving the attachment chain;

[0093] When the hydraulic motor 5 rotates, some hydraulic oil leaks from the high-pressure chamber of the hydraulic motor 5 into the housing. Most of the hydraulic oil in the housing of the hydraulic motor 5 flows into the first drain oil passage, and then flows into the second oil passage through the third check valve 7 and flows back to the return oil tank T from the B port.

[0094] A small portion of the hydraulic oil inside the housing of the hydraulic motor 5 flows into the chain lubrication oil circuit, and is discharged from the chain lubrication oil port 11 through the hydraulic check valve and the third throttle valve 10 to lubricate the chain.

[0095] When hydraulic oil flows from the return port of the hydraulic motor 5 to the back pressure check valve 6, the spring of the back pressure check valve 6 is compressed, and a pressure signal is sent to the control port of the hydraulic control check valve 9 through the control oil circuit. The hydraulic control check valve 9 opens, allowing hydraulic oil to flow from the outlet of the hydraulic control check valve 9 to the inlet and then be discharged through the chain lubrication port 11. The flow rate of the chain lubrication oil circuit is controlled by adjusting the third throttle valve 10, thereby indirectly controlling the flow rate of the first drain oil circuit.

[0096] This embodiment provides a hydraulic cylinder control system. When the hydraulic oil source is connected to port B and the return oil tank T is connected to port A, the hydraulic oil flows from port B into the rodless chamber of the hydraulic cylinder 4, the hydraulic cylinder rod extends, and the hydraulic oil in the rod chamber of the hydraulic cylinder 4 flows into the first oil circuit and flows back to the return oil tank T from port A through the first one-way throttle valve 1 and the second one-way throttle valve 2.

[0097] When the hydraulic oil flows in reverse from the rod chamber of the hydraulic cylinder 4 to the port A of the first oil circuit, the second one-way throttle valve 2 is adjusted to control the flow rate of the first oil circuit, thereby controlling the speed at which the hydraulic cylinder rod extends.

[0098] When the oil supply pressure at port B is too high, the second relief valve 32 opens, and the hydraulic oil can flow from the oil inlet of the second relief valve 32 to the oil drain port, so that the excess hydraulic oil flows back to the oil tank T from port A through the relief oil circuit, which plays an overload protection role.

[0099] When the hydraulic oil source is connected to port B and the return oil tank T is connected to port A, the hydraulic oil in the rod chamber of the hydraulic cylinder 4 flows into the third oil circuit through the first oil circuit. The pressure is insufficient to drive the hydraulic motor 5 to rotate.

[0100] At the instant when port B switches from being connected to the return oil tank T to being connected to the hydraulic oil source, the pressure at port B increases, the third check valve 7 closes, and the hydraulic oil in the housing of the hydraulic motor 5 cannot be discharged from port B through the first drain oil circuit. The hydraulic oil in the housing of the hydraulic motor 5 flows into the second drain oil circuit, and the hydraulic oil pushes the valve core of the fourth check valve 8 open from the valve seat. The hydraulic oil flows from the fourth check valve 8 into the control oil circuit, through the control oil circuit into the third oil circuit, and then back to the return oil tank T through the back pressure check valve 6.

[0101] In other embodiments, the first one-way throttle valve 1 and the second one-way throttle valve 2 can be combined into a cartridge valve group to control the flow rate of the first oil circuit, further simplifying the hydraulic circuit and hydraulic components in the hydraulic cylinder control system.

[0102] In other embodiments, the first one-way throttle valve 1, the second one-way throttle valve 2, and the bidirectional relief valve 3 can be combined into a cartridge valve group to control the flow rate of the first oil circuit, and to allow the hydraulic oil to flow back to the oil tank T through the relief oil circuit when the oil supply pressure is too high, further simplifying the hydraulic circuit and hydraulic components in the hydraulic cylinder control system.

[0103] In other embodiments, the first one-way throttle valve 1, the second one-way throttle valve 2, the bidirectional relief valve 3, and the third one-way valve 7 can be combined into a cartridge valve group to control the flow rate of the first oil circuit, and to allow the hydraulic oil to flow back to the oil tank T through the relief oil circuit when the oil supply pressure is too high. It can also prevent the hydraulic oil in the relief oil circuit from flowing back into the hydraulic motor 5, further simplifying the hydraulic circuit and hydraulic components in the hydraulic cylinder control system.

[0104] In other embodiments, the fourth check valve 8, the hydraulic check valve 9, and the third throttle valve 10 can be combined into a cartridge valve group to control the hydraulic oil to be discharged from the chain lubrication port 11 through the chain lubrication oil circuit to lubricate the chain, and to control the flow rate of the chain lubrication oil circuit. It can also prevent the hydraulic oil in the control oil circuit from flowing back into the hydraulic motor 5, further simplifying the hydraulic circuit and hydraulic components in the hydraulic cylinder control system.

[0105] In other embodiments, the third check valve 7, the fourth check valve 8, the hydraulically controlled check valve 9, and the third throttle valve 10 can be combined into a cartridge valve group to control the hydraulic oil to be discharged from the chain lubrication port 11 through the chain lubrication oil circuit to lubricate the chain, and to control the flow rate of the chain lubrication oil circuit. It can also prevent the hydraulic oil in the overflow oil circuit and control oil circuit from flowing back into the hydraulic motor 5, further simplifying the hydraulic circuit and hydraulic components in the hydraulic cylinder control system.

[0106] The beneficial effects of this invention are as follows:

[0107] (1) The hydraulic pipeline and hydraulic components are simplified, and the linkage control of hydraulic cylinder and hydraulic motor can be realized without adding hydraulic circuit;

[0108] (2) The chain lubrication port is supplied with oil by draining oil through the hydraulic motor drain port, eliminating the need for a separate chain lubrication circuit and further simplifying the hydraulic circuit.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic cylinder control system, characterized in that, Includes: hydraulic cylinder (4), first oil circuit, second oil circuit, first one-way throttle valve (1) and second one-way throttle valve (2); One end of the first oil circuit is connected to the rod chamber of the hydraulic cylinder (4) and is used to supply oil to the rod chamber of the hydraulic cylinder (4) or to discharge hydraulic oil from the rod chamber of the hydraulic cylinder (4). One end of the second oil circuit is connected to the rodless chamber of the hydraulic cylinder (4) for discharging hydraulic oil from the rodless chamber of the hydraulic cylinder (4) or supplying oil to the rodless chamber of the hydraulic cylinder (4); The first one-way throttle valve (1) and the second one-way throttle valve (2) are connected in series in the first oil circuit and are arranged in opposite directions; The first one-way throttle valve (1) is used to control the flow rate of the first oil circuit when the hydraulic oil flows in the forward direction in the first oil circuit, while the first one-way throttle valve (1) does not have a throttling effect when the hydraulic oil flows in the reverse direction in the first oil circuit. The first one-way throttle valve (1) is composed of a first one-way valve and a first throttle valve connected in parallel; The second one-way throttle valve (2) is used to control the flow rate of the first oil circuit when the hydraulic oil flows in reverse in the first oil circuit, while the second one-way throttle valve (2) does not have a throttling effect when the hydraulic oil flows in the first oil circuit in the forward direction. The second one-way throttle valve (2) is composed of a second one-way valve and a second throttle valve connected in parallel; The system also includes: a return oil tank (T), an overflow oil circuit, and a two-way overflow valve (3); the other end of the first oil circuit is port A; the other end of the second oil circuit is port B; port A and port B can be selectively connected to the hydraulic oil source and the return oil tank (T) respectively; one end of the overflow oil circuit is connected to port A, and the other end is connected to port B; The system further includes: a third oil circuit, a hydraulic motor (5), and a back pressure check valve (6); one end of the third oil circuit is connected to port A, and the other end is connected to the return oil tank (T); the hydraulic motor (5) and the back pressure check valve (6) are connected in series on the third oil circuit; the oil inlet of the hydraulic motor (5) is connected to port A, and the oil return port of the hydraulic motor (5) is connected to the oil inlet of the back pressure check valve (6); The system further includes: a first drain oil passage and a third check valve (7); one end of the first drain oil passage is connected to the drain port of the hydraulic motor (5), and the other end is connected to port B; the third check valve (7) is provided on the first drain oil passage to prevent hydraulic oil from flowing back into the hydraulic motor (5) through the first drain oil passage. The system also includes a chain lubrication circuit, a hydraulic check valve (9), a third throttle valve (10), and a chain lubrication port (11); one end of the chain lubrication circuit is connected to the drain port of the hydraulic motor (5), and the other end is connected to the chain lubrication port (11); the third throttle valve (10) is located on the chain lubrication circuit; the hydraulic check valve (9) is located on the chain lubrication circuit, the outlet of the hydraulic check valve (9) is connected to the drain port of the hydraulic motor (5), and the inlet of the hydraulic check valve (9) is connected to the chain lubrication port (11); the third throttle valve (10) is located between the inlet of the hydraulic check valve (9) and the chain lubrication port (11); The system also includes a control oil circuit, a second drain oil circuit, and a fourth check valve (8); one end of the control oil circuit is connected to the control port of the hydraulic check valve (9), and the other end is located between the return port of the hydraulic motor (5) and the inlet port of the back pressure check valve (6); one end of the second drain oil circuit is connected to the drain port of the hydraulic motor (5), and the other end is connected to the control oil circuit, and is used to discharge the hydraulic oil in the housing of the hydraulic motor (5) into the control oil circuit at the moment when the B port switches from being connected to the return oil tank (T) to being connected to the hydraulic oil source, and then flow back to the return oil tank (T) through the third oil circuit; the fourth check valve (8) is located on the second drain oil circuit and is used to prevent the hydraulic oil from flowing back into the hydraulic motor (5) through the second drain oil circuit.

2. The hydraulic cylinder control system according to claim 1, characterized in that, The first check valve is used to prevent hydraulic oil from flowing through when hydraulic oil is flowing forward in the first oil circuit; The first throttle valve is connected in parallel across the first check valve and is used to control the flow rate of the first oil circuit when hydraulic oil cannot flow through the first check valve.

3. The hydraulic cylinder control system according to claim 1, characterized in that, The second check valve is used to prevent hydraulic oil from flowing through when the hydraulic oil flows in the reverse direction in the first oil circuit; The second throttle valve is connected in parallel across the two ends of the second check valve and is used to control the flow rate of the first oil circuit when hydraulic oil cannot flow through the second check valve.

4. The hydraulic cylinder control system according to claim 1, characterized in that, The bidirectional overflow valve (3) is installed on the overflow oil line and is used to cause the hydraulic oil in the first oil line to overflow into the overflow oil line and flow back to the return oil tank (T) through the B port when the oil supply pressure at port A is too high; or, when the oil supply pressure at port B is too high, cause the hydraulic oil in the second oil line to overflow into the overflow oil line and flow back to the return oil tank (T) through the A port. The bidirectional overflow valve (3) is composed of a first overflow valve (31) and a second overflow valve (32) connected in parallel.

5. The hydraulic cylinder control system according to claim 4, characterized in that, The inlet of the first overflow valve (31) is connected to port A, and the outlet of the first overflow valve (31) is connected to port B. It is used to cause the hydraulic oil in the first oil circuit to overflow into the overflow oil circuit and flow back to the return oil tank (T) through port B when the oil supply pressure at port A is too high.

6. The hydraulic cylinder control system according to claim 4, characterized in that, The oil inlet of the second overflow valve (32) is connected to the B port, and the oil outlet of the second overflow valve (32) is connected to the A port. It is used to cause the hydraulic oil in the second oil circuit to overflow into the overflow oil circuit and flow back to the return oil tank (T) through the A port when the oil supply pressure at the B port is too high.

7. The hydraulic cylinder control system according to claim 4, characterized in that, The inlet of the back pressure check valve (6) is connected to the return port of the hydraulic motor (5), and the outlet of the back pressure check valve (6) is connected to the return tank (T) to prevent hydraulic oil from flowing back into the hydraulic motor (5) through the third oil circuit. The back pressure of the back pressure check valve (6) is greater than the pressure of the hydraulic oil returning to the rod chamber of the hydraulic cylinder (4).

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